I will answer this accusation.
Both
@JonC and I as well as most members of the BB take the Christ as being totally God and totally human. That includes both natures combined, but without sin. That is to state, the Christ is as the first Adam - pre fall - and not sinful, yet capable of being tested and tempted in every way just as every human from the fall.
That is also to state that the Christ was fully God, not just in likeness, but co -equal in all glory and authority of God. He was indeed the only God/man. He called Himself the Son of man, and also the great I Am.
What PSA does is actually cause one to consider one of the three views that you list.
For, many who present the PSA must acknowledge that they separate the human aspects from the divine. I will not get into that, at this point, but allow you to read back through the threads and see how this is evidenced.
PSA must present a divided Christ to be true. For at no time can one member of the trinity be punished by any other member of the trinity, nor can any member of the God head be polluted by sin and in need of punishment. God is holy, just, and righteous. Christ has always been God.
PSA must also present God as sinful, for it shows Him punishing one who is without sin which is an unrighteous act. The Scriptures teach that Christ carried the sin, but remained sinless.
PSA also violates the unclean making the unclean clean presentation in the Scriptures. Had Jesus become unclean, He then would be disqualified from making clean those who were unclean. Therefore, Christ never became unclean taking on the sin of the world.
PSA also violates the very substitutionary aspect that it touts. The Lord Jesus having become sin (taken on sin, carried sin) yet remained sinless cannot substitute for humans but can only satisfy the decrees of the Law that stood against man by bringing the reconciliation of God to man. There was no covering of human sins, no ignoring of human continual sins, and the wages of sin are still paid by the human body ceasing to have vitality. So, there was no true substitution, but there was satisfaction.
I could go on, but for now this is enough.